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Table 2: Results of mixed-model analysis of signal-intensity grade and degeneration grade
Initial Signal-Intensity Grade Initial Degeneration Grade Change in Signal Intensity Change in Degeneration
Disk P = .003 P = 0.002 P < .0001 P < .0001
Initial annular tear P < .0001 P < .0001 P < .0001 P < .0001
Stage – – P < .0001 P < .0001
Time between studies – – P = 0.98 P = .70
Patient was treated as a random effect, and disk and presence of an annular tear on initial MR imaging were treated as fixed effects on all the analyses. Initial signal-intensity and degeneration grades were used as the dependent variables to analyze patterns at baseline. Signal-intensity grade and degeneration grade for both stages (initial, follow-up) were the dependent variables, and stage was added as a fixed effect, to analyze change, as was the time between studies, to control for differences between patients.